In this classroom activity, students consider geographic context--features like mountains, rainforest, and rivers--in order to assess their influence on transport mode selection, speed, weight limit, and cost. Cost of transport, in turn, has significant effects on the local economy. Students will learn that people in a place must import anything they want and are unable to grow or make for themselves and that they cannot do this if they do not have some product or service that they can trade to people outside of the local area.